<?php
declare(strict_types=1);
// acl.php — shared PHP helper for every web (dmr-web, svx-web).
// Canonical copy: callmgr2/www-mumien/auth/lib/acl.php; other repos carry a COPY.
// Admin-on-admin checks. Needs acct_admin_level() and json_out() from the site.

// An admin may change another account only when their own level is strictly
// higher (and may always change themselves).
function require_privilege(string $acting_uuid, int $acting_level, string $target_uuid): void {
  if ($target_uuid === $acting_uuid) return;
  $target_level = acct_admin_level($target_uuid);
  if ($target_level >= $acting_level) {
    json_out(['ok' => false, 'error' => 'insufficient_privilege'], 403);
  }
}